blocks|key|835851|text|您可以使用日程安排|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|835852|inline+fun+Timer.schedule(
++++delay:+Long,+
++++crossinline+action:+TimerTask.()+->+Unit
):+TimerTask+(source)|code-block|syntax|javascript|835853|示例(感谢@Nguyen在这里找到它：http://jamie.mccrindle.org/2013/02/exploring-kotlin-standard-library-part-3.html)|835854|import+java.util.Timer
import+kotlin.concurrent.schedule

Timer("SettingUp",+false).schedule(500)+{+
+++doSomething()
}|835855|entityMap|0|LINK|mutability|MUTABLE|url|https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.concurrent/java.util.-timer/schedule.html|1|http://jamie.mccrindle.org/2013/02/exploring-kotlin-standard-library-part-3.html^0|5|4|0|0|0|J|28|1|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|11|8|@]|9|@$A|12|B|13|1|14]]|C|$]]|$1|K|3|L|5|F|7|15|8|@]|9|@]|C|$G|H]]|$1|M|3|-4|5|6|7|16|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]|U|$5|P|Q|R|C|$S|V]]]]

You can use <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.concurrent/java.util.-timer/schedule.html" rel="noreferrer">Schedule</a>

<pre><code>inline fun Timer.schedule(
 delay: Long, 
 crossinline action: TimerTask.() -&gt; Unit
): TimerTask (source)
</code></pre>

example (thanks @Nguyen Minh Binh - found it here: <a href="http://jamie.mccrindle.org/2013/02/exploring-kotlin-standard-library-part-3.html" rel="noreferrer">http://jamie.mccrindle.org/2013/02/exploring-kotlin-standard-library-part-3.html</a>)

<pre><code>import java.util.Timer
import kotlin.concurrent.schedule

Timer("SettingUp", false).schedule(500) { 
 doSomething()
}
</code></pre>

blocks|key|2550985|text|还有一个选项可以使用Handler+->+postDelayed|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2550986|+Handler().postDelayed({
++++++++++++++++++++//doSomethingHere()
++++++++++++++++},+1000)|code-block|syntax|javascript|2550987|entityMap^0|A|M|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

There is also an option to use <code>Handler -&gt; postDelayed</code>

<pre><code> Handler().postDelayed({
 //doSomethingHere()
 }, 1000)
</code></pre>

blocks|key|2551101|text|多方面|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2551102|1.使用Handler类|offset|length|style|CODE|2551103|Handler().postDelayed({
++++TODO("Do+something")
++++},+2000)|code-block|syntax|javascript|2551104|2.使用Timer类|2551105|Timer().schedule(object+:+TimerTask()+{
++++override+fun+run()+{
++++++++TODO("Do+something")
++++}
},+2000)

//+Shorter

Timer().schedule(timerTask+{
++++TODO("Do+something")
},+2000)


//+Shortest

Timer().schedule(2000)+{
++++TODO("Do+something")
}|2551106|3.使用Executors类|2551107|Executors.newSingleThreadScheduledExecutor().schedule({
++++TODO("Do+something")
},+2,+TimeUnit.SECONDS)|2551108|entityMap^0|0|4|7|0|0|4|5|0|0|4|9|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|11|8|@$D|12|E|13|F|G]]|9|@]|A|$]]|$1|O|3|P|5|J|7|14|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|15|8|@$D|16|E|17|F|G]]|9|@]|A|$]]|$1|S|3|T|5|J|7|18|8|@]|9|@]|A|$K|L]]|$1|U|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|V|$]]

<h2>Many Ways</h2>
<h3>1. Using <code>Handler</code> class</h3>
<pre><code>Handler().postDelayed({
 TODO(&quot;Do something&quot;)
 }, 2000)
</code></pre>
<h3>2. Using <code>Timer</code> class</h3>
<pre><code>Timer().schedule(object : TimerTask() {
 override fun run() {
 TODO(&quot;Do something&quot;)
 }
}, 2000)

// Shorter

Timer().schedule(timerTask {
 TODO(&quot;Do something&quot;)
}, 2000)


// Shortest

Timer().schedule(2000) {
 TODO(&quot;Do something&quot;)
}
</code></pre>
<h3>3. Using <code>Executors</code> class</h3>
<pre><code>Executors.newSingleThreadScheduledExecutor().schedule({
 TODO(&quot;Do something&quot;)
}, 2, TimeUnit.SECONDS)
</code></pre>

blocks|key|1037211|text|您可以launch一个coroutine，delay它，然后调用这个函数：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1037212|+/*GlobalScope.*/launch+{
+++delay(1000)
+++yourFn()
+}|code-block|syntax|javascript|1037213|如果您在类或对象前面的GlobalScope之外让协同线在那里运行，则建议在周围的类中实现CoroutineScope，这允许在必要时取消与该范围关联的所有协同。|1037214|entityMap|0|LINK|mutability|MUTABLE|url|https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/-coroutine-scope/^0|3|6|L|5|0|0|B|B|19|E|19|E|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@$9|15|A|16|1|17]]|E|$]]|$1|M|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

You could <code>launch</code> a coroutine, <code>delay</code> it and then call the function:

<pre><code> /*GlobalScope.*/launch {
 delay(1000)
 yourFn()
 }
</code></pre>

If you are outside of a class or object prepend <code>GlobalScope</code> to let the coroutine run there, otherwise it is recommended to implement the <a href="https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/-coroutine-scope/" rel="noreferrer"><code>CoroutineScope</code></a> in the surrounding class, which allows to cancel all coroutines associated to that scope if necessary.

blocks|key|2551022|text|您必须导入以下两个库：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2551023|import+java.util.*
import+kotlin.concurrent.schedule|code-block|syntax|javascript|2551024|然后用这样的方式使用它：|2551025|Timer().schedule(10000){
++++//do+something
}|2551026|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You have to import the following two libraries:

<pre><code>import java.util.*
import kotlin.concurrent.schedule
</code></pre>

and after that use it in this way:

<pre><code>Timer().schedule(10000){
 //do something
}
</code></pre>

blocks|key|835869|text|val+timer+=+Timer()
timer.schedule(timerTask+{+nextScreen()+},+3000)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|835870|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>val timer = Timer()
timer.schedule(timerTask { nextScreen() }, 3000)
</code></pre>

blocks|key|836044|text|如果您使用的是最近的Android，那么Handler空构造函数已经被废弃，您应该包括一个Looper。您可以很容易地通过Looper.getMainLooper()获得一个。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|836045|++++Handler(Looper.getMainLooper()).postDelayed({
++++++++//Your+code
++++},+2000)+//millis|code-block|syntax|javascript|836046|entityMap^0|1P|M|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

If you're using more recent Android APIs the Handler empty constructor has been deprecated and you should include a Looper. You can easily get one through <code>Looper.getMainLooper()</code>.
<pre><code> Handler(Looper.getMainLooper()).postDelayed({
 //Your code
 }, 2000) //millis
</code></pre>

blocks|key|2551201|text|如果您在一个具有viewModel作用域的片段中，可以使用Kotlin：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2551202|++++myViewModel.viewModelScope.launch+{
++++++++delay(2000)
++++++++//+DoSomething()
++++}|code-block|syntax|javascript|2551203|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you are in a fragment with viewModel scope you can use Kotlin coroutines:
<pre><code> myViewModel.viewModelScope.launch {
 delay(2000)
 // DoSomething()
 }
</code></pre>

blocks|key|2551002|text|在3秒之后展示祝酒词的一个简单示例：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2551003|fun+onBtnClick()+{
++++val+handler+=+Handler()
++++handler.postDelayed({+showToast()+},+3000)
}

fun+showToast(){
++++Toast.makeText(context,+"Its+toast!",+Toast.LENGTH_SHORT).show()
}|code-block|syntax|javascript|2551004|entityMap^0|1|2|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

A simple example to show a toast after 3 seconds :

<pre><code>fun onBtnClick() {
 val handler = Handler()
 handler.postDelayed({ showToast() }, 3000)
}

fun showToast(){
 Toast.makeText(context, "Its toast!", Toast.LENGTH_SHORT).show()
}
</code></pre>

blocks|key|2551054|text|如果您正在寻找泛型用法，下面是我的建议：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2551055|创建一个名为Run的类|offset|length|style|CODE|2551056|class+Run+{
++++companion+object+{
++++++++fun+after(delay:+Long,+process:+()+->+Unit)+{
++++++++++++Handler().postDelayed({
++++++++++++++++process()
++++++++++++},+delay)
++++++++}
++++}
}|code-block|syntax|javascript|2551057|然后像这样使用：|2551058|Run.after(1000,+{
++++//+print+something+useful+etc.
})|2551059|entityMap^0|0|6|3|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|W|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|Y|8|@]|9|@]|A|$K|L]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

If you are looking for generic usage, here is my suggestion:

Create a class named as <code>Run</code>:

<pre><code>class Run {
 companion object {
 fun after(delay: Long, process: () -&gt; Unit) {
 Handler().postDelayed({
 process()
 }, delay)
 }
 }
}
</code></pre>

And use like this:

<pre><code>Run.after(1000, {
 // print something useful etc.
})
</code></pre>

blocks|key|1037276|text|我建议你用科特林协同剂，如果你想取消的话。它既简单又重量轻。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1037277|fun+repeatFun():+Job+{
++++return+coroutineScope.launch+{++
++++++++while(isActive)+{
++++++++++++//do+your+work+here
++++++++++++delay(1000)
++++++++}
++++}
}

//start+the+loop
val+repeatFun+=+repeatRequest()

//Cancel+the+loop
repeatFun.cancel()|code-block|syntax|javascript|1037278|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

i suggest to use kotlin coroutine and if you want to cancel it. its simple and light weight.
<pre><code>fun repeatFun(): Job {
 return coroutineScope.launch { 
 while(isActive) {
 //do your work here
 delay(1000)
 }
 }
}

//start the loop
val repeatFun = repeatRequest()

//Cancel the loop
repeatFun.cancel()
</code></pre>

blocks|key|835989|text|我建议使用SingleThread，因为在使用之后不必将它杀死。此外，Kotlin语言中也不推荐使用"stop()“方法。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|835990|private+fun+mDoThisJob(){

++++Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate({
++++++++//TODO:+You+can+write+your+periodical+job+here..!

++++},+1,+1,+TimeUnit.SECONDS)
}|code-block|syntax|javascript|835991|此外，你也可以用它来做定期工作。它非常有用。如果您希望在每秒钟内完成工作，则可以设置它的参数：|835992|Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate(Runnable命令，长initialDelay，长周期，TimeUnit单元)；|blockquote|835993|TimeUnit值是:纳秒、微秒、毫秒、秒、分钟、小时、天。|835994|entityMap^0|5|C|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|W|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|X|8|@]|D|@]|E|$]]|$1|M|3|N|5|O|7|Y|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|Z|8|@]|D|@]|E|$]]|$1|R|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|S|$]]

I recommended using SingleThread because you do not have to kill it after using. Also, &quot;stop()&quot; method is deprecated in Kotlin language.
<pre><code>private fun mDoThisJob(){

 Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate({
 //TODO: You can write your periodical job here..!

 }, 1, 1, TimeUnit.SECONDS)
}
</code></pre>
Moreover, you can use it for periodical job. It is very useful. If you would like to do job for each second, you can set because parameters of it:
<blockquote>
Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate(Runnable command, long initialDelay, long period, TimeUnit unit);
</blockquote>
TimeUnit values are: NANOSECONDS, MICROSECONDS, MILLISECONDS, SECONDS, MINUTES, HOURS, DAYS.

blocks|key|836098|text|我使用以下函数：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|836099|fun+<T>+delayedAsyncTask(delayMs:+Long+=+0,+task:+()+->+T):+ScheduledFuture<T>+{
++++return+Executors
++++++++.newSingleThreadScheduledExecutor()
++++++++.schedule(Callable<T>+{+task()+},+delayMs,+TimeUnit.MILLISECONDS)
}

fun+<T>+asyncTask(task:+()+->+T)+=+delayedAsyncTask(0,+task)|code-block|syntax|javascript|836100|这是延迟函数的单元测试。当然，使用返回的未来是可选的。|836101|++++@Test
++++fun+`delayed+task+work+correctly`()+{
++++++++val+future+=+delayedAsyncTask(1000)+{
++++++++++++"lambda+returns+hello+world"
++++++++}
++++++++assertEquals(false,+future.isDone)
++++++++Thread.sleep(1100)
++++++++assertEquals(true,+future.isDone)
++++++++assertEquals("lambda+returns+hello+world",+future.get())
++++}|836102|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I use the following function(s):
<pre class="lang-kotlin prettyprint-override"><code>fun &lt;T&gt; delayedAsyncTask(delayMs: Long = 0, task: () -&gt; T): ScheduledFuture&lt;T&gt; {
 return Executors
 .newSingleThreadScheduledExecutor()
 .schedule(Callable&lt;T&gt; { task() }, delayMs, TimeUnit.MILLISECONDS)
}

fun &lt;T&gt; asyncTask(task: () -&gt; T) = delayedAsyncTask(0, task)
</code></pre>
Here's a unit test for the delayed function. Use of the returned future is optional of course.
<pre class="lang-kotlin prettyprint-override"><code> @Test
 fun `delayed task work correctly`() {
 val future = delayedAsyncTask(1000) {
 &quot;lambda returns hello world&quot;
 }
 assertEquals(false, future.isDone)
 Thread.sleep(1100)
 assertEquals(true, future.isDone)
 assertEquals(&quot;lambda returns hello world&quot;, future.get())
 }
</code></pre>

As the title, is there any way to call a function after delay (1 second for example) in <code>Kotlin</code>?

How to call a function after delay in Kotlin?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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作为标题，在Kotlin中有在延迟后(例如1秒)调用函数的方法吗？

问在Kotlin延迟后如何调用函数？
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问在Kotlin延迟后如何调用函数？
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